Hairbrush



FIG. 1 is a perspective view of a hairbrush showing my design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view, the left side being a mirror image thereof;

FIG. 5 is an enlarged front elevational view thereof; and,

FIG. 6 is an enlarged rear elevational view thereof. 

The ornamental design for a hairbrush, as shown and described. 